请帮忙中译英（用括号里的词）,
问题描述：
请帮忙中译英（用括号里的词）,
一群年轻人准备在山脚下搭一个帐篷（put up）
两小时后我们开展体育活动怎么样?（how about）
女孩子们都穿着色彩缤纷的衣裙出席宴会(have...on)
那药对你有良好功效,一天三次.
我们不可指望别人的帮助,我们应该互相帮助（rely on）
火灾发生时Tom碰巧在那儿.
答
1.A group of young people are going to put up a tent at the foot of the hill.
2.How about take physical exercises in two hours' time （或：in two hours）?
3.The girls were present at the party with having their colorful dresses on.
4.That medicine has a good effect on you.Have it three times a day.
5.We can't rely on others' help.We ought to help each other.
6.Tom happened to be there when the fire took place.